Aneurysm interatrial septum

I am 38 years old and have had recently echocardiogram done since I felt that I had irregular heartbeat. The results were almost normal, however one finding puzzled my family doctor who had no idea what it meant: "Mobile ? aneurysm interatrial septum. No definite evidence of atrial shunt." Can you please let me know what it means? Thank you.

Dear Lubenka,
An aneurysm is a "sac or dilation" of a structure of the body. The intratrial septum is the wall between the two upper chambers of the heart. Aneurysms in this area appear as a "floppy" intra-atrial wall. This is sometimes associated with a hole or shunt between the two chambers but this was not detected in your case. In general this is not something which needs treatment.

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